This is a hard one to recommend, but I'm going to do it anyway:
You Gotta Breathe and the sequel Sometimes When We Touch by Kyra4 (Draco x Hermione) (Multi-Chapter) (NSFW)
Get ready to be put through the wringer with this series. Straight from the get go you are thrown into a world of pain.
Just when you thought it couldn't get any worse it does, and does, and does.
This fic involves heavy angst and trauma surrounding the aftermath of a noncon act. The act is not explicitly described but the emotions detailed can be triggering. Not that I want to put you off, just to warn you. It goes deep on how it not not only affects the survivor but those around them.
The noncon is not the focus point of the story, just the starting point. It is a story about love, revenge, friendship, misunderstandings, forgiveness, heartache, jealousy, healing and so much more.
I love the dynamics between the four main characters (Hermione, Draco, Harry and Ron) and how they interact. They each have their own ways of processing and coping with this horrific event which is very believable to each of their personalities and sets them on a journey of recovery.
Its beautifully written, despite the subject matter, and treated with the utmost care.
Both parts of the series are complete.
I don't recommend this for everyone unless you like your angst, not only dark, but traumatising.